Mac OS X 10.7.5 is en route, or at least that’s what the betas would have you believe.

Per MacNN, Apple has released a fourth beta of OS X 10.7.5 to developers. The download, build 11G45, is about 1.16GB as a delta, or 1.93GB as a combo update. As with the previous build there are no known issues, and Apple is again asking developers to test graphics quality and performance, as well as media importing, viewing, and editing.

Mac OS X 10.7.5 could be the last major update for OS X Lion, since Apple is now concentrating development work on Mountain Lion, which was launched late in July. Subsequent Lion updates will probably be intended to patch specific components.

Stay tuned for additional details and if you’ve gotten your mitts on the new beta, please let us know what you make of it in the comments.